So far as we can tell from this leaked JDM brochure of next year's Lexus LS range, styling changes include new bumpers for the front and rear as well as a slight modification to the lights and a new set of wheels.
From the inside there are a few minor updates plus sources say there will now be an integrated night vision system (although we're not sure if that will make it to Australia) for better visibility.
The interesting bit of the leaked news though is the possibility of a performance variant of the LS called “Version SZ”. Currently there is no indication of any power upgrade over the LS460, just a sports kit and more aggressive wheels.
Thanks to Lexus Enthusiast for the pictures.